van der Waals Heteroepitaxy of Germanene Islands on Graphite - Archive ouverte HAL Access content directly
Journal Articles Journal of Physical Chemistry Letters Year : 2016

van der Waals Heteroepitaxy of Germanene Islands on Graphite

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1
Luca Persichetti
  • Function : Author
Fatme Jardali
  • Function : Author
Holger Vach
Anna Sgarlata
  • Function : Author
Maurizio de Crescenzi
  • Function : Author
Adalberto Balzarotti
  • Function : Author

Abstract

We fabricated flat, two-dimensional germanium sheets showing a honeycomb lattice that matches that of germanene by depositing submonolayers of Ge on graphite at room temperature and subsequent annealing to 350 degrees C. Scanning tunneling microscopy shows that the germanene islands have a small buckling with no atomic reconstruction and does not give any hints for alloy formation and hybridization with the substrate. Our density functional theory calculations of the structural properties agree well with our experimental findings and indicate that the germanene sheet interacts only weakly with the substrate underneath. Our band structure calculations confirm that the Dirac cone of free-standing germanene is preserved for layers supported on graphite. The germanene islands show a small but characteristic charge transfer with the graphite substrate which is predicted by our ab initio simulations in excellent agreement with scanning tunneling spectroscopy measurements.

Dates and versions

hal-01435208 , version 1 (13-01-2017)

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Luca Persichetti, Fatme Jardali, Holger Vach, Anna Sgarlata, Isabelle Berbezier, et al.. van der Waals Heteroepitaxy of Germanene Islands on Graphite. Journal of Physical Chemistry Letters, 2016, 7 (16), pp.3246-3251. ⟨10.1021/acs.jpclett.6b01284⟩. ⟨hal-01435208⟩
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